Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. An apparatus for correcting inter-channel power imbalance, applicable to an associated receiver in a multicarrier optical communication system, the apparatus comprising: a receiving unit configured to receive reference information transmitted by a neighboring receiver; and a correcting unit configured to perform power imbalance error correction according to the reference information, wherein the reference information is an estimation result of a spectrum gap width between a first channel and a second channel in the neighboring receiver, and the correcting unit comprises: a calculating module configured to one of average and weighted average the estimation result of the spectrum gap width between the first channel and the second channel in the associated receiver and the estimation result of the spectrum gap width between the first channel and the second channel in the neighboring receiver; and a correcting module configured to identify one of an averaged and weighted averaged value as the spectrum gap width between the first channel and the second channel; wherein the first channel is a central channel in the associated receiver and a neighboring channel in the neighboring receiver, and the second channel is a central channel in the neighboring receiver and a neighboring channel in the associated receiver.
An apparatus corrects power imbalances between optical channels in a multicarrier receiver. It receives, from a neighboring receiver, an estimate of the frequency gap width between a central channel in the local receiver and its neighboring channel, where the neighboring receiver similarly provides the frequency gap width between *its* central channel and *its* neighboring channel. The apparatus then averages (or weighted-averages) its own frequency gap width estimate with the estimate from the neighboring receiver, using the result as the corrected frequency gap width. This reduces errors caused by power imbalances between channels.
2. The apparatus according to claim 1 , wherein the apparatus further comprises: a spectrum information acquiring unit configured to acquire a received signal and extract spectrum information from the received signal; and a gap width measuring unit configured to determine reference power according to a predefined reference power level, and set a frequency difference between two frequency points on a gap between the first channel and the second channel in the spectrum information of the received signal corresponding to the reference power as the estimation result of the spectrum gap width between the first channel and the second channel in the associated receiver.
The power imbalance correction apparatus (described in claim 1) also includes a spectrum information acquisition unit. This unit obtains a received optical signal, extracts spectrum information from it, determines a reference power level, and measures the frequency difference between two points on the spectrum corresponding to the reference power. This frequency difference between spectral features serves as the apparatus's own estimate of the spectrum gap width between the channels.
3. The apparatus according to claim 2 , wherein the spectrum information acquiring unit comprises: a serial-to-parallel converting module configured to divide the received signal into a predefined number of sections; a Fourier transform module configured to perform Fourier transform on each section of the received signal to obtain a spectrum of each section of the received signal; and a calculating module configured to calculate a modular square of the spectrum of each section of the received signal to obtain a power spectrum of each section of the received signal, and one of average and weighted average power spectra of all sections of the received signals to obtain an averaged power spectrum of all the sections of the received signals as the spectrum information.
In the spectrum information acquisition unit (described in claim 2), a serial-to-parallel converter divides the received optical signal into sections. A Fourier transform module then computes the spectrum of each section. A calculating module calculates the power spectrum for each section by calculating the magnitude squared of its frequency components. The calculating module then averages (or weighted-averages) the power spectra of all sections to produce an averaged power spectrum which is used as the extracted spectrum information.
4. The apparatus according to claim 3 , wherein the spectrum information acquiring unit further comprises: a time-domain windowing module configured to perform a window function convolution on the spectrum of each section of the received signal.
The spectrum information acquisition unit (described in claim 3) also performs time-domain windowing. This means applying a window function convolution on the spectrum of each section of the received optical signal *before* averaging them, effectively smoothing the spectrum.
5. The apparatus according to claim 1 , wherein the apparatus further comprises: a spectrum recovery unit configured to perform spectrum recovery on an initial input signal, and use a spectrum recovered signal as a next input signal of a next step of processing.
The power imbalance correction apparatus (described in claim 1) also incorporates spectrum recovery. This module processes an initial input optical signal to recover a flattened or 'corrected' version of its original spectrum, using this recovered signal as the input for subsequent signal processing stages in the receiver.
6. The apparatus according to claim 5 , wherein the spectrum recovering unit performs the spectrum recovery on the initial input signal by multiplying an amplitude of each frequency point of the spectrum of the initial input signal by a correction coefficient.
The spectrum recovery process (described in claim 5) corrects the spectrum of the initial input signal by multiplying the amplitude of each frequency component in the signal's spectrum by a correction coefficient.
7. The apparatus according to claim 6 , wherein the correction coefficient is a reciprocal of a response amplitude of a receiver at each frequency point.
The correction coefficient used for spectrum recovery (described in claim 6) is the reciprocal of the receiver's amplitude response at each frequency point. This compensates for frequency-dependent variations in the receiver's sensitivity.
8. The apparatus according to claim 1 , wherein the apparatus further comprises: a noise eliminating unit configured to determine a noise floor power of an initial input signal, and subtract the noise floor power at each frequency point of the initial input signal to obtain a noise eliminated signal as a next input signal of a next step of processing.
The power imbalance correction apparatus (described in claim 1) also performs noise elimination. It estimates the noise floor power in an initial input signal and subtracts this noise floor power from each frequency point in the signal. The resulting noise-eliminated signal is then used as input for subsequent signal processing.
9. An apparatus for correcting inter-channel power imbalance, applicable to an associated receiver in a multicarrier optical communication system, the apparatus comprising: a receiving unit configured to receive reference information transmitted by a neighboring receiver; and a correcting unit configured to perform power imbalance error correction according to the reference information wherein the reference information is one of a power ratio of the second channel power to the noise floor power calculated in the neighboring receiver and power of the second channel calculated in the neighboring receiver to the noise floor power calculated in the neighboring receiver, and the correcting unit comprises: a determining module configured to determine a signal power ratio between the first channel and the second channel one of according to a power ratio of the first channel to the noise floor and the power ratio of the second channel to the noise floor and according to power of the first channel and the power of the second channel; and an adjusting module configured to adjust one of the power and a reference power of the second channel according to the signal power ratio; wherein, the first channel is a central channel in the associated receiver and a neighboring channel in the neighboring receiver, and the second channel is a central channel in the neighboring receiver and a neighboring channel in the associated receiver.
An apparatus corrects power imbalances between optical channels by communicating with a neighboring receiver. The apparatus receives, from a neighboring receiver, a power ratio of a neighboring channel to the noise floor calculated in the neighboring receiver or power of the neighboring channel calculated in the neighboring receiver to the noise floor power calculated in the neighboring receiver. It calculates the signal power ratio between a central channel in the local receiver and its neighboring channel based on local and neighbor channels to the noise floor, and adjusts the power (or reference power) of the second channel using this ratio, correcting for power imbalances.
10. The apparatus according to claim 9 , wherein the apparatus further comprises: a spectrum information acquiring unit configured to acquire a received signal and extract spectrum information from the received signal; and a spectrum recovering unit configured to one of calculate the power ratio of the first channel to the noise floor and calculate the power of the first channel according to the spectrum information.
The power imbalance correction apparatus (described in claim 9) further includes a spectrum information acquiring unit to obtain the received signal and extract its spectrum. A spectrum recovering unit calculates a power ratio of the central channel to the noise floor, or calculates the power of the central channel, using this extracted spectrum information.
11. The apparatus according to claim 10 , wherein the spectrum information acquiring unit comprises: a serial-to-parallel converting module configured to divide the received signal into a predefined number of sections; a Fourier transform module configured to perform Fourier transform on each section of the received signal to obtain a spectrum of each section of the received signal; and a calculating module configured to calculate a modular square of the spectrum of each section of the received signal to obtain a power spectrum of each section of the received signal, and one of average and weighted average power spectra of all sections of received signals to obtain an averaged power spectrum of all the sections of the received signals as the spectrum information.
In the spectrum information acquisition unit (described in claim 10), a serial-to-parallel converter divides the received optical signal into sections. A Fourier transform module then computes the spectrum of each section. A calculating module calculates the power spectrum for each section by calculating the magnitude squared of its frequency components. The calculating module then averages (or weighted-averages) the power spectra of all sections to produce an averaged power spectrum which is used as the extracted spectrum information.
12. The apparatus according to claim 11 , wherein the spectrum information acquiring unit further comprises: a time-domain windowing module configured to perform a window function convolution on the spectrum of each section of the received signal.
The spectrum information acquisition unit (described in claim 11) also performs time-domain windowing. This means applying a window function convolution on the spectrum of each section of the received optical signal *before* averaging them, effectively smoothing the spectrum.
13. The apparatus according to claim 10 , wherein the spectrum recovering unit is further configured to: perform spectrum recovery on an initial input signal, and use the spectrum recovered signal as a next input signal of a next step of processing.
The spectrum recovering unit (described in claim 10) performs spectrum recovery on an initial input signal to provide a recovered signal for subsequent processing steps.
14. The apparatus according to claim 13 , wherein the spectrum recovering unit performs the spectrum recovery on the initial input signal by multiplying an amplitude of each frequency point of the spectrum of the initial input signal by a correction coefficient.
The spectrum recovery process (described in claim 13) corrects the spectrum of the initial input signal by multiplying the amplitude of each frequency component in the signal's spectrum by a correction coefficient.
15. The apparatus according to claim 14 , wherein the correction coefficient is a reciprocal of a response amplitude at each frequency point.
The correction coefficient used for spectrum recovery (described in claim 14) is the reciprocal of the receiver's amplitude response at each frequency point. This compensates for frequency-dependent variations in the receiver's sensitivity.
16. The apparatus according to claim 10 , wherein the apparatus further comprises: a noise eliminating unit configured to determine a noise floor power of the initial input signal, and subtract the noise floor power at each frequency point of the initial input signal to obtain a noise eliminated signal as a next input signal of a next step of processing.
The power imbalance correction apparatus (described in claim 10) also performs noise elimination. It estimates the noise floor power in an initial input signal and subtracts this noise floor power from each frequency point in the signal. The resulting noise-eliminated signal is then used as input for subsequent signal processing.
17. A method for correcting inter-channel power imbalance, applicable to an associated receiver in a multicarrier optical communication system, the method comprising: receiving by the associated receiver reference information transmitted by a neighboring receiver; and performing power imbalance error correction by the associated receiver according to the reference information, wherein the reference information is an estimation result of a spectrum gap width between a first channel and a second channel in the neighboring receiver, and the performing the power imbalance error correction by the associated receiver according to the reference information comprises: one of averaging and weighted averaging an estimation result of the spectrum gap width between the first channel and the second channel in the associated receiver and the estimation result of the spectrum gap width between the first channel and the second channel in the neighboring receiver; and identifying the one of an averaged and weighted averaged value as the spectrum gap width between the first channel and the second channel; wherein, the first channel is a central channel in the associated receiver and a neighboring channel in the neighboring receiver, and the second channel is a central channel in the neighboring receiver and a neighboring channel in the associated receiver.
A method corrects power imbalances between optical channels. It involves a receiver obtaining frequency gap width information from a neighboring receiver (the estimate of frequency gap width between a central channel in the neighboring receiver and *its* neighboring channel). Then, the receiver averages (or weighted-averages) its *own* estimate of the gap width with the neighboring receiver's value, using the result to correct power imbalances in the local receiver's channel spectrum.
18. A method for correcting inter-channel power imbalance, applicable to an associated receiver in a multicarrier optical communication system, the method comprising: receiving by the associated receiver reference information transmitted by a neighboring receiver; and performing power imbalance error correction by the associated receiver according to the reference information, wherein the reference information is a power ratio of the second channel to one of the noise floor calculated in the neighboring receiver, and the power of the second channel calculated in the neighboring receiver, and the performing power the imbalance error correction by the associated receiver according to the reference information comprises: determining a signal power ratio between the first channel and the second channel one of according to a power ratio of the first channel to the noise floor and the power ratio of the second channel to the noise floor and according to power of the first channel and the power of the second channel; and adjusting one of the power and reference power of the second channel according to the signal power ratio; wherein, the first channel is a central channel in the associated receiver and a neighboring channel in the neighboring receiver, and the second channel is a central channel in the neighboring receiver and a neighboring channel in the associated receiver.
A method for correcting power imbalances between optical channels, applicable to an associated receiver in a multicarrier optical communication system, involves the associated receiver receiving reference information from a neighboring receiver. This reference information is a power ratio of the neighboring channel to the noise floor calculated in the neighboring receiver or power of the neighboring channel to the noise floor power calculated in the neighboring receiver. The method determines a signal power ratio between a central channel and neighboring channel, adjusts the power or reference power of the central channel based on the signal power ratio, correcting the power imbalance.
19. A coherent optical receiver, comprising an apparatus for correcting inter-channel power imbalance, configured to receive reference information transmitted by a neighboring receiver, and perform a power imbalance error correction according to the reference information, wherein the reference information is an estimation result of a spectrum gap width between a first channel and a second channel in the neighboring receiver, and the apparatus for correcting inter-channel power imbalance is configured to: one of average and weighted average the estimation result of the spectrum gap width between the first channel and the second channel in the associated receiver and the estimation result of the spectrum gap width between the first channel and the second channel in the neighboring receiver; and identify one of an averaged and weighted averaged value as the spectrum gag width between the first channel and the second channel; wherein, the first channel is a central channel in the associated receiver and a neighboring channel in the neighboring receiver, and the second channel is a central channel in the neighboring receiver and a neighboring channel in the associated receiver.
A coherent optical receiver includes an apparatus for correcting power imbalances between optical channels. The apparatus receives, from a neighboring receiver, an estimate of the frequency gap width between a central channel in the neighboring receiver and its neighboring channel. The receiver then averages (or weighted-averages) its own frequency gap width estimate with the estimate from the neighboring receiver, using the result as the corrected frequency gap width. This reduces errors caused by power imbalances between channels.
20. A coherent optical receiver, comprising an apparatus for correcting inter-channel power imbalance, configured to receive reference information transmitted by a neighboring receiver, and perform a power imbalance error correction according to the reference information, wherein the reference information is one of a power ratio of the second channel power to the noise floor power calculated in the neighboring receiver and power of the second channel calculated in the neighboring receiver to the noise floor power calculated in the neighboring receiver, and the apparatus for correcting inter-channel power imbalance is configured to: determine a signal power ratio between the first channel and the second channel one of according to a power ratio of the first channel to the noise floor and the power ratio of the second channel to the noise floor and according to power of the first channel and the power of the second channel; and adjust one of the power and a reference power of the second channel according to the signal power ratio; wherein, the first channel is a central channel in the associated receiver and a neighboring channel in the neighboring receiver, and the second channel is a central channel in the neighboring receiver and a neighboring channel in the associated receiver.
A coherent optical receiver incorporates an apparatus for correcting power imbalances. This apparatus receives, from a neighboring receiver, a power ratio of the neighboring channel to the noise floor calculated in the neighboring receiver or power of the neighboring channel to the noise floor power calculated in the neighboring receiver. The apparatus calculates the signal power ratio between a central channel and its neighboring channel based on local and neighbor channels to the noise floor, and adjusts the power (or reference power) of the central channel using this ratio, correcting for power imbalances.
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November 21, 2017
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